Merge branch '4.1' into 4.2

* 4.1:
  Fix typos in doc blocks
  [Debug] ignore underscore vs backslash namespaces in DebugClassLoader
  [TwigBridge][Form] Prevent multiple rendering of form collection prototypes
  [FrameworkBundle] fix describing routes with no controllers
  [DI] move RegisterServiceSubscribersPass before DecoratorServicePass
  Update ValidationListener.php
  [Yaml] ensures that the mb_internal_encoding is reset to its initial value
  [WebLink] Fixed documentation link
  [Security] getTargetPath of TargetPathTrait must return string or null
  [Hackday][Serializer] Deserialization ignores argument type hint from phpdoc for array in constructor argument
  Optimize perf by replacing call_user_func with dynamic vars
  [Routing] fix dumping same-path routes with placeholders
  [Security] defer log message in guard authenticator
  [Validator] Added IBAN format for Vatican City State
  merge conflicts
  filter out invalid Intl values
  filter out invalid language values
  [Validator] Fixed grouped composite constraints
  [Form] Filter arrays out of scalar form types
  Fix HeaderBag::get phpdoc

Author: nicolas-grekas

Console/Descriptor/TextDescriptor.php

@@ -57,7 +57,7 @@ protected function describeRouteCollection(RouteCollection $routes, array $optio
 
             if ($showControllers) {
                 $controller = $route->getDefault('_controller');
-                $row[] = $this->formatCallable($controller);
+                $row[] = $controller ? $this->formatCallable($controller) : '';
             }
 
             $tableRows[] = $row;

Controller/RedirectController.php

@@ -50,7 +50,7 @@ public function __construct(UrlGeneratorInterface $router = null, int $httpPort
      * @param string     $route             The route name to redirect to
      * @param bool       $permanent         Whether the redirection is permanent
      * @param bool|array $ignoreAttributes  Whether to ignore attributes or an array of attributes to ignore
-     * @param bool       $keepRequestMethod Wheter redirect action should keep HTTP request method
+     * @param bool       $keepRequestMethod Whether redirect action should keep HTTP request method
      *
      * @throws HttpException In case the route name is empty
      */
@@ -94,7 +94,7 @@ public function redirectAction(Request $request, string $route, bool $permanent
      * @param string|null $scheme            The URL scheme (null to keep the current one)
      * @param int|null    $httpPort          The HTTP port (null to keep the current one for the same scheme or the default configured port)
      * @param int|null    $httpsPort         The HTTPS port (null to keep the current one for the same scheme or the default configured port)
-     * @param bool        $keepRequestMethod Wheter redirect action should keep HTTP request method
+     * @param bool        $keepRequestMethod Whether redirect action should keep HTTP request method
      *
      * @throws HttpException In case the path is empty
      */